Arithmetic and control unit



FIG. 1 is a front elevational view of a first embodiment of an arithmetic and control unit showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is another top plan view thereof wherein the disc tray portion is in the open position;

FIG. 8 is another top plan view thereof wherein the ROM cassette portion is in the open position, the portions including the connector portions, the disc tray portion and the ROM cassette portion in broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 9 is a front elevational view of a second embodiment of an arithmetic and control unit showing my new design;

FIG. 10 is a top plan view thereof;

FIG. 11 is a right side elevational view thereof;

FIG. 12 is a rear elevational view thereof;

FIG. 13 is a bottom plan view thereof;

FIG. 14 is a left side elevational view thereof;

FIG. 15 is another top plan view thereof wherein the cover is in the open position; and,

FIG. 16 is another top plan view wherein the cover is in the open position, the portions including the cover, inside drive, connector, and button portions in broken lines are for illustrative purposes only and form no part of the claimed design.

The broken lines are shown in FIGS. 1, 4, 5, 7, 9, 10, 12, 13 and 15 for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an arithmetic and control unit, as shown and described. 